Need some weight in back

Does anyone have any good ideas for adding some weight to the rear of the bed on a pickup? My truck can not handle the washboards on our dirt roads unless I have 200+ lbs of weight in back. I currently have some cheap sandbags I picked up this winter but they are falling apart and I need some new bags or other containers to put the sand in. I would really like to find something that is easy to secure and preferably at least 2 containers as I do have to take the weight out to haul other things once in a while. I tried to find some canvas sand bags online but could not find any place to buy just a few sand bags and really dont need 100+ sandbags. Walmart has some heavy duty plastic storage totes that can be secured in the bed, does anyone know if these would work? I would like to stay away from using old tubes out of tires as I have not had the best of luck with those lasting very long in the past.

Any ideas would be great as my duck tape patches aren't holding up to well lol. Cheaper would be better at this point, I have looked at those bladders that can be filled with water but I really need to concentrate the weight at the rear of the bed.

Theres a company that makes a water bladder that fits in the bed and it has baffles so the water doesn't slosh around. I can't think of the company name but maybe someone can help. If I remember I'll post.

Theres a company that makes a water bladder that fits in the bed and it has baffles so the water doesn't slosh around. I can't think of the company name but maybe someone can help. If I remember I'll post.

Theres a company that makes a water bladder that fits in the bed and it has baffles so the water doesn't slosh around. I can't think of the company name but maybe someone can help. If I remember I'll post.

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I believe you are referring to Shurtrax, while those look like a great idea I dont see it working to well for a work truck Not to mention the fact that they are kind of expensive with the 100 lb bag costing $70

I guess I need to fill out my signature one of these days. Pickup is an 08 silverado so not really looking to change the bumper although if money wasnt an option I would definitely consider buying an aftermarket one as my chrome is nasty looking.

My little 1986 Toyota rode like a buckboard-heck it used to loosen my fillings and hurt my neck.
Once I screwed up and used cat litter containers filled with sand-
They broke loose crashed into the front of the bed and dented it.
I finally settled on filling screw top gallon water jugs with water-8 lbs each.
I needed about 40- yes 40 - of them to improve the ride.
No matter what you use you want them to break or open up if they break loose during a crash.
Small-2.5 gallon plastic gas cans(20 lbs lbs) might fit the bill.
I wouldn't want an individual one to be too heavy
Charlie

At this point I think that is the problem, bought the pickup at around 50,000 miles and the dealer put new rear shocks on while it was on the lot. Even after putting like 12,000 miles on it, they still are way to stiff to handle washboards. Maybe I need to look into some softer shocks?

My little 1986 Toyota rode like a buckboard-heck it used to loosen my fillings and hurt my neck.
Once I screwed up and used cat litter containers filled with sand-
They broke loose crashed into the front of the bed and dented it.
I finally settled on filling screw top gallon water jugs with water-8 lbs each.
I needed about 40- yes 40 - of them to improve the ride.
No matter what you use you want them to break or open up if they break loose during a crash.
Small-2.5 gallon plastic gas cans(20 lbs lbs) might fit the bill.
I wouldn't want an individual one to be too heavy
Charlie

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Yup that is kind of what I was wanting to avoid, so far my sandbags have not broke loose but they came close a time or two.

If anyone knows of a website or place to buy individual sand bags (empty canvas ones) that would be great.